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Q.

sin2⁡A−sin2⁡Bsin⁡Acos⁡A−sin⁡Bcos⁡B is equal to

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a

tan(A - B)

b

tan(A + B)

c

cot(A - B)

d

cot(A + B)

answer is B.

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Detailed Solution

sin2⁡A−sin2⁡Bsin⁡Acos⁡A−sin⁡Bcos⁡B=2sin⁡(A+B)sin⁡(A−B)sin⁡2A−sin⁡2B=2sin⁡(A+B)sin⁡(A−B)2sin⁡(A−B)cos⁡(A+B)=tan⁡(A+B)
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